The bug

Sculk sensor does not detect brushing. This is a physical change, so it would be expected that the sensor detects this action as a vibration.

It only detects when the brushing is stopped, due to the item interaction finish game event.

To reproduce

1. Obtain a brush.
2. Place down a sculk sensor.
3. Use the brush on a block.

Observed result

The sculk sensor is not activated.